Use variables for minimum host versions and bump Python to 3.6

Minimum Git, tar, Python and gcc versions are specified in quite a few
different places. Let's add some variables for these so there's no
chance of missing one if they're updated in future. Additionally, for
hardknott the minimum Python version is 3.6 so set that as the value for
Python.

(From yocto-docs rev: 9a802bc4bb0438c2540f360a08c7787caf64408a)

Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/documentation/dev-manual/start.rst b/documentation/dev-manual/start.rst
index 39036183b0..84abf4c51f 100644
--- a/documentation/dev-manual/start.rst
+++ b/documentation/dev-manual/start.rst
@@ -314,13 +314,13 @@ Project Build Host:
    should be able to run on any modern distribution that has the
    following versions for Git, tar, Python and gcc.
 
-   -  Git 1.8.3.1 or greater
+   -  Git &MIN_GIT_VERSION; or greater
 
-   -  tar 1.28 or greater
+   -  tar &MIN_TAR_VERSION; or greater
 
-   -  Python 3.5.0 or greater.
+   -  Python &MIN_PYTHON_VERSION; or greater.
 
-   -  gcc 5.0 or greater.
+   -  gcc &MIN_GCC_VERSION; or greater.
 
    If your build host does not meet any of these three listed version
    requirements, you can take steps to prepare the system so that you